Artemis might use a swipe gesture to visually hint at the relation between upvoting and boosting, as shown in the main animation. Here’s a static app mockup with both swipe levels displayed. I’d also imagine that there should be a setting that auto-upvotes posts when boosting.
It looks really nice, but I think it would be a lot more efficient to keep ‘right-swipe’ available to quickly return to the feed from a thread. Makes mobile browsing a lot more streamlined.